package playlists_test

import (
	"context"
	"testing"

	"github.com/jackc/pgx/v5/pgtype"

	"git.fabledsword.com/bvandeusen/minstrel/internal/db/dbq"
	"git.fabledsword.com/bvandeusen/minstrel/internal/playlists"
)

// A mix holds a song once (M498 #5438) and never a held-back video rip
// (#5439): of a single and its album cut, the better-ranked copy stays; a rip
// is left out and the next copy of its song takes the place.
func TestOneCopyPerSong_Integration(t *testing.T) {
	pool := newPool(t)
	ctx := context.Background()
	q := dbq.New(pool)
	single := seedTrack(t, pool, "copies-single", "copies-artist")
	albumCut := seedTrack(t, pool, "copies-album-cut", "copies-artist")
	rip := seedTrack(t, pool, "copies-rip", "copies-artist")
	clean := seedTrack(t, pool, "copies-clean", "copies-artist")
	other := seedTrack(t, pool, "copies-other", "copies-artist")
	for _, pair := range [][]pgtype.UUID{{single.ID, albumCut.ID}, {rip.ID, clean.ID}} {
		if _, err := q.LinkTracksAsSong(ctx, pair); err != nil {
			t.Fatal(err)
		}
	}
	if _, err := pool.Exec(ctx, `UPDATE tracks SET source_verdict = 'suspect' WHERE id = $1`, rip.ID); err != nil {
		t.Fatal(err)
	}

	in := []playlists.RankedCandidate{
		{TrackID: single.ID}, {TrackID: rip.ID}, {TrackID: albumCut.ID}, {TrackID: other.ID}, {TrackID: clean.ID},
	}
	out, err := playlists.OneCopyPerSong(ctx, q, in)
	if err != nil {
		t.Fatal(err)
	}
	want := []pgtype.UUID{single.ID, other.ID, clean.ID}
	if len(out) != len(want) {
		t.Fatalf("got %d tracks, want %d", len(out), len(want))
	}
	for i, w := range want {
		if out[i].TrackID != w {
			t.Errorf("position %d = %s, want %s", i, uuidString(out[i].TrackID), uuidString(w))
		}
	}
}